Cap assembly

Abstract: A cap assembly (52) for a bottle (40) having a cylindrical neck portion (44) which has a central longitudinal axis, external threads and a circular end edge which defines an opening to the bottle, said cap assembly comprising: (a) a cap (104) which has an end wall (112) and a circular side wall (108) which has internal threads (110) which are complementary with said external threads for screwing said cap onto said neck portion about an axis of rotation; (b) a thrust washer (106) which lies within said side wall against the end wall of said cap; and (c) means for mounting said thrust washer on said cap so that said thrust washer is rotatable about said axis relative to said cap is disclosed.

Description: This invention relates to a cap assembly; more particularly, it relates to a cap assembly for a bottle. The present subject-matter was divided-out of EP 94 305 376.9, which has now issued as EP-B-657382 directed to a fluid delivery system for aspirating liquid from a bottle (40) and for conveying the liquid to a manifold fitting (55) of an analytical instrument, said bottle having an interior space which contains a quantity of liquid and an opening to said interior space, said manifold fitting being connected to a source of sub-atmospheric pressure, said fluid delivery system comprising: (a) a valve assembly (50) for location in the opening of a bottle (40), said valve assembly having a liquid conduit and a gas conduit which are closed when said valve assembly is in a first state for preventing the flow of gas into the bottle and the flow of liquid out of the bottle and which are open when said valve assembly is in a second functional state wherein gas is allowed to flow into the bottle from outside of the bottle and liquid is allowed to flow out of the bottle through the valve assembly to said manifold fitting (55); (b) a tube (61) which extends from said valve assembly (50) into the liquid within the interior space of said bottle (40); and (c) a fluid coupling means (54) having an outer end and an inner end, said outer end having a connector fitting (130) which is adapted to be complementary with said manifold fitting (55) for being removably operatively connected to said manifold fitting, said inner end being adapted to be removably operatively connected to said valve assembly (50) for rendering said valve assembly to said second or functional state, said fluid coupling means having a liquid passageway operatively connected to said liquid conduit and a gas passageway operatively connected to said gas conduit when said fluid coupling means is operatively connected to said valve assembly, said liquid passageway extending from said inner end to said outer end for enabling liquid to be drawn by said analytical instrument from said bottle (40) through said tube, said valve assembly and said liquid passageway to said manifold fitting, said gas passageway extending from said inner end in direct communication with said gas conduit to a point outside of said bottle for enabling air to flow from outside of said bottle through said gas passageway and said gas conduit and into the interior space of said bottle, said coupling means having a sealing relationship with said valve assembly which limits the flow of air from said ambient atmosphere into said bottle only through said gas passageway and said gas conduit and which limits the flow of liquid from said bottle to said aspirating means only through said liquid passageway and said liquid conduit; said fluid delivery system being characterised in that said valve assembly (50) comprises: (a) a housing (56,56') for location at said opening and adapted to extend into said bottle (40), said housing having a first chamber (62), said chamber having a first outer opening (64) to be within the opening of the bottle, a first inner opening (66,73) and a first intermediate opening (68), said first inner and intermediate openings being for operative connection to the interior space of the bottle; (b) a first elastomeric valve member (58) which is located within said first chamber (62), said first elastomeric valve member having an outer second chamber (80), an inner second chamber (82) and a penetrable wall (84) between said inner and outer second chambers which normally seals said inner second chamber from said outer second chamber, said outer second chamber having a second outer opening (85) to lie within said first outer opening and the opening of said bottle, and an air duct (86) in said penetrable wall which extends from said outer second chamber to said first chamber (62), said inner second chamber having a second inner opening (88) to said first inner opening (66,73), said tube (61) having a first open end which is located within said first and second inner openings, and a second open end adapted to extend into the liquid within said bottle to form a channel for flow of liquid from said bottle (40) into said second outer chamber (80), said first elastomeric valve member forming a seal at said first inner opening between said tube (61) and said housing (56,56'); and (c) a second elastomeric valve member (60) which is located within said outer second chamber (80), said second valve member having a third chamber (92), said third chamber having a third outer opening (94) within said second outer opening (85) and the opening to the bottle (40), and a third inner opening (96) which faces said penetrable wall (84) and which is closed by said penetrable wall, said second valve member engaging said penetrable wall to block said air duct, the inner end of said coupling means (54) being effective to displace said penetrable wall (84) to unblock said air duct so that said air duct forms a connection between said first chamber (62) and said third chamber (92), the inner end of said coupling means being effective to penetrate the wall between said inner and outer second chamber (80,82) so that the inner end of said coupling extends into said inner second chamber (82) and the liquid passageway of said coupling means is operatively connected to said inner second chamber (82). That disclosure relates generally to a system for dispensing liquid from a container, such as a bottle. It is specifically directed to a system for aspirating liquid reagent from a container for use in analytical instruments. A preferred reagent bottle of the type described includes an opening which is closed by a valve. A fluidic coupling component provides a fluidic connection between the valve and the analytical instrument. The analytical instrument includes a manifold to which the coupling is connected and means for creating suction at the manifold. The reagent is selectively drawn from its container by the analytical instrument as needed in accordance with predetermined testing procedures. As reagent is drawn from the bottle, air or gas must be introduced or vented into the bottle to replace the reagent. However, the bottle must be sealed with respect to liquid and gas when reagent is not being drawn, i.e. when the bottle is not attached to the instrument. A liquid seal must also be maintained during drawing of reagent from the bottle to prevent leakage of reagent to the outside of the bottle, i.e. when the bottle is attached to the instrument. Known systems for delivery of liquid such as reagent which make use of needles or other fluid couplings or bayonet-like plungers have been less than satisfactory with respect to sealing of the bottle during and between drawing of fluid from the bottle. Creating an effective fluid seal at the point where the coupling component is connected to the analytical instrument is a necessary consideration. Leaking around the cap of the bottle is another problem. Leaking is likely to occur if the cap is tightened too loosely following the filling of the bottle. The process of replacing an empty reagent bottle with a full bottle remains a difficult and time-consuming step with some prior art systems. Care must be exercised to ensure that all of the components of the system are properly connected to ensure feeding of reagent from the bottle to the analytical instrument to ensure proper sealing between interconnected components to prevent leaking of reagent from the system. A cap assembly according to the preamble of claim 1 is shown in U.S. Patent No. 4,993,573 issued February 19, 1991 to Freidel et al . The bottle closure of the Freidel et al patent includes a fixed stopper, which is fit within the mouth of a bottle, and a cap which is rotatable about the stopper. A liquid delivery system is shown in U.S. Patent No. 4,854,486, issued 8 August 1989 to Daley et al . The delivery system in the Daley patent includes a valve assembly for a container which has a bottom opening. A vent tube extends from the valve assembly to the top of the container. The delivery system also includes a probe which has a liquid passageway and a gas passageway. The probe is adapted to be inserted into the valve assembly so that the liquid from the container is able to flow from the container through the valve assembly and into the liquid passageway of the probe for eventual delivery to an analytical instrument. The gas passageway of the probe is operatively connected to the vent tube within the container so that air enters the container through the gas passageway and tube to replace the liquid which is withdrawn from the container. Although the liquid delivery system of Daley and the fluid delivery system disclosed in the parent have some similar structural components, the two systems function in very different manners with respect to the flow of gas and liquid through the valve assembly and probe. Reference may be made to the above-mentioned European application for further background. For completeness, reference may also be made to a related divisional EP 97 203 232.0/829451, which relates to a system for enabling the aspiration of liquid from a bottle and the conveyance of the aspirated liquid to an analyzing instrument. It is an object of the present invention to provide a cap assembly for a bottle which when used in conjunction with an elastomeric valve member or flange which prevents distortion of the valve member or flange as the valve member or flange is compressed by the cap assembly during tightening of the cap on the bottle. The present invention relates to a cap assembly for application to a threaded neck portion of a bottle which has a central longitudinal axis. The cap assembly includes a cap and a thrust washer. The cap has an end wall and a threaded side wall for screwing onto the threaded neck portion of a bottle. The thrust washer lies within the side wall against the end wall. The thrust washer is mounted on the cap so that the thrust washer is rotatable about the axis of the bottle neck relative to the cap. More particularly, the present invention provides a cap assembly (52) for a bottle (40) having a cylindrical neck portion (44) which has a central longitudinal axis (47), external threads (46) and a circular end edge which defines an opening to the bottle, the said cap assembly comprising: (a) a cap (104) which has an end wall (112) and a circular side wall (108) which has internal threads (110) which are complementary with the said external threads for screwing the said cap (104) onto the said neck portion (44) about an axis of rotation, the said cap (104) including a central circular aperture (114) in the said end wall (112); (b) a thrust washer (106) having a base wall (119), the said thrust washer (106) lying within the said circular side wall (108) and against the said end wall (112) of the said cap (104); and (c) means for mounting the said thrust washer (106) on the said cap (104) so that the said thrust washer (106) is rotatable about the said axis relative to the said cap (104); characterised in that the said means for mounting the said thrust washer (106) on the said cap (104) comprises an annular side wall (118) extending from the said base wall (119), a central opening (124,126), a plurality of segments (121) extending outwardly from the said side wall (118), the said segments including an external ridge (122) at a distal end, the outer diameter of the said ridges (122) in relation to the said axis being slightly greater than the diameter of the said central circular aperture (114) of the said cap (104), the said segments (121) being resilient so as to be deformable towards the center of the said central opening (124,126) when forced against the said circular central aperture (114) of the said cap (104). Preferably, the said segments (121) are parallel with the said axis. The said base wall (119) may include an annular peripheral flange (128) which is spaced from the said central aperture (126) and which extends away from the said annular side wall (118). Having indicated the scope of the present invention, it will now be further described in context with reference to the accompanying illustrative drawings wherein: FIG. 1 is a top plan view of a reagent bottle to which a fluid delivery system is operatively connected, FIG. 2 is a side elevational view of the reagent bottle and fluid delivery system, FIG. 3 is an end view of the reagent bottle and the fluid delivery system, looking in the direction of arrow III of FIG. 1, FIG. 4 is an exploded side elevational view of the coupling means and all of the individual elements of the valve assembly, FIG. 5 is a vertical cross-sectional view of the coupling means and valve assembly, FIG. 6 is a vertical cross-sectional view of the valve assembly, FIG. 7 is a top plan view of the coupling means, FIG. 8 is an end view of the coupling means looking from the right of FIG. 7, FIG. 9 is an end view of the coupling means looking from the left of FIG. 7, FIG. 10 is a side elevational view of the coupling means, FIG. 11 is a bottom plan view of the coupling means, FIG. 12 is a top plan view of the housing portion of the valve assembly, FIG. 13 is an end view of the housing, looking from the left of FIG. 12, FIG. 14 is an end view of the housing looking from the right of FIG. 12, FIG. 15 is a bottom plan view of the housing, FIG. 16 is a vertical cross-sectional view of the housing, taken along the line XVI-XVI of FIG. 12, FIG. 17 is an outer end view of a thrust washer which is part of the cap assembly that holds the valve assembly to the bottle, FIG. 18 is a side elevational view of the thrust washer, FIG. 19 is an inner end view of the thrust washer, FIG. 20 is a vertical cross-sectional view of the thrust washer taken along the line XX-XX of FIG. 17 and looking in the direction of the arrows, FIG. 21 is an outer end view of the cap portion of the cap assembly, FIG. 22 is a side elevational view of the cap, FIG. 23 is a vertical cross-sectional view of the cap, FIG. 24 is an outer end view of a first valve member and which forms part of the valve assembly, FIG. 25 is a top plan view of the first valve member, FIG. 26 is an inner end view of the first valve member, FIG. 27 is a vertical cross-sectional view of the first valve member, taken along the line XXVII-XXVII of FIG. 25 and looking in the direction of the arrows, FIG. 28 is an outer end view of a second valve member which forms part of the valve assembly, FIG. 29 is a top plan view of the second valve member, FIG. 30 is an inner end view of the second valve member, and FIG. 31 is a vertical cross-sectional view of the second valve member taken along the line XXXI-XXXI of FIG. 29 and looking in the direction of the arrows. FIG. 32 is a front elevational view of a manifold fitting of an analytical instrument, FIG. 33 is a vertical cross-sectional view of the manifold fitting taken along the line XXXIII-XXXIII of FIG. 32 and looking in the direction of the arrows, FIG. 34 is a vertical cross-sectional view of the coupling means operatively connected to the manifold fitting. FIG. 35 is a top plan view of the modified valve assembly housing, and FIG. 36 is a side elevational view of a modified valve assembly housing. Referring first to FIGS. 1-5, the valve assembly is generally indicated by the reference numeral 50. The coupling means is generally indicated by the reference numeral 54. The present cap assembly is generally indicated by the reference numeral 52. The valve assembly 50, the coupling means 54 and the present cap assembly 52 are operatively connected to a reagent bottle 40 which has an interior space 42, a bottom wall 45, and a neck portion 44. As shown in FIG. 5, the neck 44 of the bottle 40 has a horizontal bore 48 which extends from the outer open end of the neck to the interior space 42. The neck 44 has external threads 46 which are spaced from the opening 48. A tubular inwardly-extending projection or "blowdown" 49 extends from the neck portion 44 into the space 42 and represents one part of locking means for the valve assembly which is described hereinafter. The "blowdown" 49 is formed as a result of the plastic molding process and is shown somewhat exaggerated in FIG. 5. The bottle 40 has a central longitudinal axis 47 and is designed to be supported in a generally horizontal position but at a slight angle to the horizontal as shown in FIG. 2. Also, the neck portion 44 is substantially above the central longitudinal axis 47 of the bottle. Referring particularly to FIG.4, the present cap assembly 52 comprises a cap which is generally indicated by the reference numeral 104 and a thrust washer which is generally indicated by the reference numeral 106. The valve assembly 50 comprises a housing, a first embodiment of which is generally indicated by the reference numeral 56, a first valve member which is generally indicated by the reference numeral 58, a second valve member which is generally indicated by the reference numeral 60 and a tube 61 which extends from the valve assembly 50 into the interior assembled operative positions in FIG. 6 and are shown operatively connected to the coupling means 54 in FIG. 5. Referring specifically to FIGS. 12-16, the housing 56 has a cylindrical main body portion, generally indicated by the reference numeral 69, which contains a primary bore 62 which has an air vent 68. The housing 56 has an outer end portion, generally indicated by the reference numeral 67, which contains an outer opening 64 to the primary bore 62 and an inner end portion, generally indicated by the reference numeral 71, which contains a secondary bore 66. Preferably, the main body portion 69 tapers slightly from a relatively large diameter at the outer end portion 67 to a relatively small diameter at the inner end portion 71. The primary bore 62 has a horizontal central longitudinal axis 59. The secondary bore 66 extends at a downward angle from the primary bore 62 to an inner opening 73. The bore 62 constitutes a first chamber. The outer opening 64 constitutes a first outer opening of the first chamber. The secondary bore 66 and opening 73 constitute a first inner opening of the first chamber. The air vent 68 is located at the top of the bore 62 and constitutes a first intermediate opening of the bore or first chamber. A cam surface 65 extends at a downward angle from the primary bore 62 to the secondary bore 66. An annular bead 72 is located on the inwardly facing surface of the flange 70. Tab means, generally indicated by the reference numeral 74, is located at the inner end of the housing 56. Tab means 74 comprises a relatively stiff inner tab 76 and a deflectable resilient outer tab 78 which is slightly spaced from the tab 76. Tabs 76 and 78 extend transversely of the axis 59. The housing 56 is preferably made of a substantially rigid thermoplastic material. Preferably, the housing is formed by injection molding. The material is sufficiently rigid so that the tab 76 which is relatively broad along a line which is parallel with the longitudinal axis 59 of the housing 56 is substantially non-deflectable. In contrast, the portion 78 which is relatively narrow along a line which is parallel with the central longitudinal axis 59 of the housing is substantially resiliently deflectable. The deflectable outer tab 78 extends further from the central longitudinal axis 59 of the housing than the relatively stiff inner portion 76. When the housing is inserted through the opening of the bottle 40, the tab 76 passes freely within the confines of the tubular projection 49, while the resilient tab 78 is deflected by the interior surface of the projection 49 away from the inner tab and toward the axis 59. When the housing reaches the end of the tubular projection 49, as shown in FIG. 5, the tab 78 returns to its normal position adjacent the tab 76. Movement of the housing toward the opening 48 of the bottle causes the tab portion 78 to engage the projection 49 and to deflect the tab 78 toward the tab 76. However, since the tabs 78 and 76 are slightly spaced with respect to each other, the tab 78 will be deflected a slight amount until it engages the adjacent edge surface of the tab 76. At this point, further deflection of the tab 78 is prevented and no further outward movement or the housing 56 is possible. Therefore, the tab means 74 and a tubular projection 49 constitute cooperating looking means for the valve assembly 52 which enables the valve assembly to be inserted into the bottle 40 and which prevents the housing from being withdrawn from the bottle after it has been fully inserted. A housing to bottle joint (press or press and weld) is established to prevent torque transmitted from the cap tightening operation from rotating the housing such that downward deflection of the tube is not altered. A second embodiment of the valve housing is illustrated in FIGS. 35 and 36 and is generally indicated by the reference numeral 56'. Housing 56' is identical to housing 56 except that housing 56' does not have tab means 74. The housing is pressed into the bottle neck. All features of housing 56' which are identical with features of housing 56 are identified with the same reference numeral with the addition of a prime after the numeral. Referring specifically to FIGS. 24-27, the first valve member 58 is made of an elastomeric material and comprises a relatively large diameter head portion 83 and a relatively small diameter flexible neck portion 95. The head portion 83 contains an outer second chamber 80 which has a second outer opening 85 and an annular ridge 87 which is adjacent the opening 85. An annular external flange 89 is located adjacent the second outer opening 85. The neck portion 95 has an inner second chamber 82 which has a second inner opening or socket 88. The outer and inner second chambers 80 and 82, respectively, are separated by a penetrable wall 84. A slit 90 is located in the wall 84 and extends from the chamber 82 to a relatively small diameter bore 93 which is connected to the chamber 80. The slit 90 is normally closed when the valve is in a first state due to the resilient nature of the valve member 58, so that the wall 84 normally provides a seal between the chambers 80 and 82. However, the slit 90 can be physically forced through an interference fit to an open position to create an opening between the outer and inner chambers 80 and 82, respectively, when the value is in a second or functional state. The chamber 80 is also connected to the outside of the valve member 58 by a plurality of air ducts 86 in the wall 84. Referring to FIGS. 28-31, the second valve member 60 comprises an elastomeric body which has an outer surface 97 and a third chamber 92. The chamber 92 has a third outer opening 94 and a third inner opening 96. An annular groove 100 is located in the outer surface 97. An annular ridge 102 extends from the inner surface 91 which defines the third chamber 92. The ridge 102 extends into the chamber 92 at a point approximately mid-way between the outer and inner openings 94 and 96, respectively. An annular flange 98 extends around the outer periphery of the valve member 60 between the outer opening 94 and the annular groove 100. The second valve member 60 is designed to be inserted within the outer second chamber 80 of the first valve member 58, wherein the first annular ridge 87 of the valve member 58 engages the groove 100 of the valve member 60. This ensures that the valve members 60 is properly located or seated within the chamber 80 in a predetermined position. In this predetermined position, the third inner opening 96 is closed by the wall 84. The opening 96 is horizontally aligned with the inner second chamber 82 and can be operatively connected to the chamber 82 through the hole 93 and the slit 90. However, since the slit 90 is normally closed, the chamber 80 is normally sealed from the chamber 82. When the valve member 60 is inserted within the valve member 58, the flanges 98 and 89 abut as shown in FIG. 6. One end of the tube or straw 61 is inserted into the socket 88. The joined valve members 60 and 58 are then inserted into the first chamber or primary bore 62 of the housing 56 so that the flange 89 is located between the flanges 70 and 98 as shown in FIG. 6. The free end of the tube 61 is inserted into the primary bore 62 and is deflected by the cam surface 65 to the secondary bore 66 and then through the secondary bore 66 so that the tube extends beyond the opening 73. As the tube 61 and valve members 60 and 58 approach their final position as shown in FIG. 5, the flexible neck portion 95 strikes the cam surface 65 and is deflected towards and into the bore 66 and forms a seal between the tube 61 and the housing 56 at the bore 66. Since the bore 66 extends at a downward angle from the valve assembly 50 so that when the valve assembly 50 is inserted into the bottle 40, the opposite end of the tube contacts the lower bottom most wall 45 of the bottle 40 as shown in FIG. 2. This ensures that substantially all of the reagent within the bottle will be aspirated. The angle of the opening 66 also causes the inner end of the valve member 58 to become distorted due to the elastomeric nature of the valve member 58 as shown in FIG. 6. The inner second chamber 82 is operatively connected to the interior space 42 of the bottle through the tube 61. Referring to FIG.5, the present cap assembly 52 comprises a cap, generally indicated by the reference numeral 104, and a thrust washer, generally indicated by the reference numeral 106. The details of the thrust washer 106 are shown in FIGS. 17-20. Details of the cap 104 are shown in FIGS. 21-23. Referring specifically to FIGS.21-23, the cap 104 has a circular side wall 108 and an outer end wall 112 which is transverse to the side wall 108. The inner surface of the side wall 108 has internal threads 110. The end wall 112 has a circular outer opening 114 which is horizontally aligned with a circular inner opening 116 which is defined by the inner peripheral edge 117 of the side wall 108. The cap 104 has a central longitudinal axis 115 which extends through the centers of the openings 114 and 116. Referring specifically to FIGS. 17-20, the thrust washer 106 has a circular side wall 118 and an inner end wall 119. The side wall 118 has an external ridge 122 and a plurality of slots 120 which create a plurality of outwardly extending segments 121. The outer periphery of the side wall 118 defines an outer circular opening 124. The inner end wall 119 is transverse to the side wall 118 and has an inner circular opening 126. A circular inwardly facing flange 128 is located at the outer peripheral edge of the wall 119. The present cap assembly 52 is assembled by inserting the thrust washer 106 into the cap 104 so that the side wall 118 extends through the opening 114 of the cap. The outer diameter of the ridge 122 is slightly greater than the diameter of the circular opening 114. The thrust washer 106 and the cap are both constructed of a relatively rigid thermoplastic material by injection molding. However, the segments 121 of the thrust washer 106 are sufficiently resilient so as to be deflected toward the center of the opening 126 when they are forced against the peripheral edge of the opening 114. The ridge 122 has an outwardly facing beveled surface which forces each segment 121 of the wall 118 inwardly towards the central axis of the thrust washer when the wall 118 of the thrust washer is forced against the edge of the opening 114. This causes the wall 118 to be forced through the opening 114 of the wall 112 so that the external ridge 122 is located on the outside of the wall 112 and yieldably locks the thrust washer in position within the cap 104 as shown in FIG. 5. The thrust washer 106 is releasably locked against movement along the axis 115 relative to the cap 104 but is free to rotate about the axis 115 relative to the cap 104. Referring particularly to FIGS. 7-11, the fluid coupling means or coupler 54 comprises a horizontal main body portion 132 which has a central longitudinal axis 127. A connector fitting which is generally indicated by the reference numeral 130 is located at the outer end of the housing and a terminal nipple 134 is located at the inner end of the housing. The connector fitting 130 is adapted to be operatively connected to the complementary manifold fitting 55, see FIGS. 32-34, of aspirating means which forms part of an analytical instrument (not shown). The connector fitting 130 has an outer end surface 129 which has a circular groove 131. An elastomeric sealing ring 133 is located within the groove 131 and extends beyond the outer end surface 129. The connector fitting 130 has a relatively wide tab 137 and a relatively narrow tab 139. Preferably, the tabs 137 and 139 are diametrically opposed and extend transversely of the longitudinal axis 127. Alternate positioning and configuration of the tabs of the connector fitting may be accomplished to engage a respective manifold fitting. Tab 137 has an inwardly facing engaging surface 141. One end of the surface 141 has a bevel 143. A flange stop 145 is located at the opposite end of the surface 141 and extends inwardly and transversely of the surface 141. The tab 139 has an inwardly facing engaging surface 147. One end of the surface 147 has a bevel 149. An annular flange 136 extends transversely from the central longitudinal horizontal axis 127 and is located adjacent and spaced from the connector fitting 130. A pair of fingers 144 extends from the flange 136 toward the inner end of the main body portion 132. A longitudinal horizontal bore 138 extends from an outer opening 140 at the fitting 130 through the main body portion 132 and the nipple 134 to an inner opening 142. The bore 138 functions as a liquid passageway. An annular groove 146 is located in the outer surface of the main body portion. A longitudinal groove 148 is located in the outer surface of the main body portion 132 and intersects the annular groove 146. The longitudinal groove 148 functions as a gas passageway. The coupling means 54 is operatively connected to the complementary manifold fitting 55 fixture of an analytical instrument which is capable of creating a suction at the opening 140. Referring to FIGS. 32-34, the manifold fitting 55 includes a manifold cavity 150 and a front opening 152 to the cavity. A fluid port 156 is located in an access surface 154 which forms the base of the cavity and which faces the front opening 152. The fluid port 156 is connected to a source of sub-atmospheric pressure, which is part of the analytical instrument (not shown). A first projection 158 and a second projection 160 extend toward each other at the opening 152. The projections 158 and 160 are spaced from each other and define therebetween a first relatively wide slot-162 and a second relatively narrow slot 164. The projection 158 has an inner surface 159 which is spaced from and faces the access surface 154. The projection 160 has an inner surface 161 which is spaced from and faces the access surface 154. The operation and advantages of such a fluid delivery system will now be readily understood in view of the above description. After the valve assembly 50 has been assembled as shown in FIG.6, it is inserted into the opening 48 of the bottle 40 as shown in FIG. 5. The valve assembly 50 is applied to the bottle 40 by inserting the assembly into the bore 48 of the neck portion 44 of the bottle in a fixed predetermined position. The valve assembly is inserted so that the air vent 68 of the housing 56 faces upwardly and the tube 61 extends downwardly when the bottle 40 is in a generally horizontal position as shown in FIG. 2. The housing is fixed to the bottle in any one of several ways. In one embodiment, the housing is fixed to the neck of the bottle by fusing the flange 70 to the recessed annular edge 53 of the bottle, preferably by ultrasonic welding. When this procedure is used, the annular bead 72 functions as an energy director for the ultrasonic energy and is fused to the edge 53. In another embodiment, the valve assembly 50 is fixed to the neck of the bottle by "press fitting" the housing 56 within the bore or opening 48. This is accomplished in one of two ways. A press fit is accomplished by making the outer diameter of the insertable portion of the housing slightly smaller than the diameter of the bore 48 so that the elongated beads 63 extend beyond the diameter of the bore 48. The housing 56 is then forced into the bore 48. The beads 63 distort due to the plastic composition of the housing and enable the housing to remain in the fixed predetermined position. The valve assembly can also be press fitted into the bore 48 by making the outer diameter of the insertable portion of the housing slightly larger than the diameter of the bore 48. In this preferred embodiment, the inclusion of the beads 63 is optional. The tapered configuration of the main body portion 69 facilitates the press fitting of the housing 56. The valve assembly can also be locked in the bottle by tab means 74 as described above. The present cap assembly 52 is then screwed onto the neck 44 of the bottle. As the present cap assembly is rotated, the flanges 98, 89 and 70 are squeezed together. This provides a liquid and air-tight seal between the valve assembly and the bottle at the neck 44. When the present cap assembly is tightened sufficient to cause friction between the thrust washer 106 and the elastomeric flange 98, the thrust washer 106 stops rotating with the cap as the cap continues to be turned in the advancing direction onto the neck 44. As a result, during the cap's torquing, the thrust washer applies only a horizontal force to the elastomeric flanges 98 and 89. This prevents twisting or distortion of the flanges 98 and 70 in any way except by direct horizontal compression as the cap is tightened. This also enables the cap to advance by compressing the flanges 89 and 98 until the inwardly facing flange 128 of the thrust washer engages the outer edge of the neck 44. This provides a positive and reproducible stop during the cap's torquing onto a bottle. This predetermined compression of the flanges 98 and 70 creates an ideal sealing condition. After the present cap assembly 52 has been applied to the valve assembly and bottle, the bottle is thereby sealed against the flow of liquid or gas into or out of the bottle. This represents the first state of the valve assembly. The tube 61 creates a passageway for fluid in the bottle to the inner second chamber 82, but the wall 84 prevents the fluid from passing into the chamber 80. Air within the bottle is free to enter the first chamber 62 of the housing through the air vent 68 and into the air ducts 86, but the second valve member 60 forms a seal at the openings 86 to prevent air from going beyond of the outer second chamber 80. A closure tab (not shown) is inserted into cap opening 114 to keep the valve assembly free of dust. The connector fitting 130 of the coupling means 54 is operatively connected to the complementary manifold fitting 55. The connector fitting 130 is inserted into the cavity 150 of the manifold fitting 55 by aligning the tab 137 with the slot 162 and the tab 139 with the slot 164 and pushing the end surface 129 toward the access surface 154. The coupling means 54 is then rotated clockwise to a predetermined position as viewed in FIG. 34. The bevels 143 and 149 engage the inner surfaces 159 and 161, respectively and function as cam surfaces to guide the tabs 137 and 139 between each of the first and second projections 158 and 160, respectively, and the access surface 154. The bevels 143 and 149 are biased against the surfaces 159 and 161, respectively, by the elastomeric sealing ring 133. When the tabs 137 and 139 are positioned behind the projections 158 and 160, respectively, the sealing ring is compressed against the access surface 154 and forms a seal around the port 156. The coupling means 54 is rotated about the axis 127 for approximately 90°, at which point the flange 145 engages the adjacent edge 163 of the projection 158 to prevent further rotation. At this point, the longitudinal groove 148 faces upwardly as shown in FIG. 34. Connector fitting 130 of the coupling means 54 is operatively connected to the manifold fitting 55 as shown in FIG. 34. The opening 140 of the bore 138 is axially aligned with the port 156 so that the port 156 is operatively connected to the bore or liquid passageway 138. The coupling means 54 is operatively connected to the valve assembly by moving the bottle toward the manifold so that the coupling means extends horizontally into the third chamber 92. When this occurs, the nipple 134 enters into the small diameter bore 93, thereby expanding the bore 93 and simultaneously expanding the slit 90 sufficiently to allow the nipple to penetrate the wall 84 and extend into the inner second chamber 82 as shown in FIG. 5. The shoulder 135 of the main body portion engages the wall 84 and forces the wall 84 away from the inner end of the second valve member 60, thereby creating a passageway between the chamber 62 and the chamber 80. When the coupling means 54 is fully inserted into the valve assembly 50 as shown in FIG. 5, the annular ridge 102 of the second valve member engages the annular groove 146 of the coupling means 54 so that the coupling means is properly located within the valve assembly at a predetermined location relative to the valve assembly. At the same time, the fingers 144 engage the outer wall 112 of the cap 104 to prevent the coupling means from going beyond this predetermined position. The fingers 144 also function as finger grips for enabling an operator to easily connect and disconnect the coupling means 54 to the manifold fitting 55. When the coupling means 54 is properly located, the inner end of the groove 148 extends into the outer second chamber 80. The outer end of the groove 148 extends beyond the present cap assembly 52 to create an air or gas passageway between the chamber 80 to a point outside of the bottle cap. When the bottle is connected to the coupling means 54, it is supported on a slightly inclined supporting tray 170, which forms part of the analyzing instrument (not shown). The bottle is supported in a substantially horizontal position and with a slight upward tilt toward the opening of the bottle due to the inclined angle of the supporting tray. The bottle is filled with fluid to the extent that the fluid is just below the air vent 68 and the groove 148 so that these elements lie in the air space above the top or the bottle above the fluid. This air space is minimal and filling of the bottle is maximized by the fact that the air vent 68 is located at the top of the housing 56, the groove 148 is located at the top of the coupling means 54, the neck 44 of the bottle 40 is located above the center line of the bottle and the bottle is tilted slightly upward toward the neck portion 44. When suction is applied at the opening 40 of the fitting 130, fluid or reagent is drawn from the bottle through the tube 61 to the chamber 82 and thence to the opening 140 through the bore 138 of the coupling means 54 for further routing from the manifold for use by the analytical instrument. As reagent is drawn from the bottle, a volume of air or gas is drawn into the bottle through the passageway which is created by the groove 148, the chamber 80, openings 86, chamber 62 and opening 68.

Claims: A cap assembly (52) for a bottle (40) having a cylindrical neck portion (44) which has a central longitudinal axis (47), external threads (46) and a circular end edge which defines an opening to the bottle, the said cap assembly comprising: (a) a cap (104) which has an end wall (112) and a circular side wall (108) which has internal threads (110) which are complementary with the said external threads for screwing the said cap (104) onto the said neck portion (44) about an axis of rotation, the said cap (104) including a central circular aperture (114) in the said end wall (112); (b) a thrust washer (106) having a base wall (119), the said thrust washer (106) lying within the said circular side wall (108) and against the said end wall (112) of the said cap (104); and (c) means for mounting the said thrust washer (106) on the said cap (104) so that the said thrust washer (106) is rotatable about the said axis relative to the said cap (104); characterised in that the said means for mounting the said thrust washer (106) on the said cap (104) comprises an annular side wall (118) extending from the said base wall (119), a central opening (124,126), a plurality of segments (121) extending outwardly from the said side wall (118), the said segments including an external ridge (122) at a distal end, the outer diameter of the said ridges (122) in relation to the said axis being slightly greater than the diameter of the said central circular aperture (114) of the said cap (104), the said segments (121) being resilient so as to be deformable towards the center of the said central opening (124,126) when forced against the said circular central aperture (114) of the said cap (104). A cap assembly (52) as claimed in claim 1 wherein the said segments (121) are parallel with the said axis. A cap assembly (52) as claimed in claim 1 wherein the said base wall (119) includes an annular peripheral flange (128) which is spaced from the said central aperture (126) and which extends away from the said annular side wall (118).

Inventors: HEALEY DAVID T, KARKANTIS PETER N, SCAVITTO JOHN A, TRAVERS RICHARD L, VENOOKER RONALD J, HEALEY, DAVID T., KARKANTIS, PETER N., SCAVITTO, JOHN A., TRAVERS, RICHARD L., VENOOKER, RONALD J.
Applicants: BAYER AG, BAYER CORPORATION
Application year: 1994
Main classification: B67D5
IPC codes: G01N35, B01L3, B67D7